Where is the pie menu
You can find all this functions in the Object/Snap menu (or Mesh/Snap if you're in Edit mode).

In Edit/Preferences/Keymap, you can set the very first parameter to "Blender" if you want the same keymap used in most tutorials.

If you want to change this particular shortcut, or know the shortcut defined in your keymap for that pie menu : in Edit/Preferences/Keymap, type "snap" into the search field. Under "3D view", locate "wm.call_menu_pie". You can change the assigned shortcut by clicking on it.